Shut-off device

ABSTRACT

An example shut-off device includes a valve body to surround a section of a pipe and form a chamber about the section of the pipe. The example shut-off device also includes a first flange bearing on a first side of the chamber. The first flange bearing in a closed position forming a first seal between the pipe and the chamber. The example shut-off device also includes a second flange bearing on a second side of the chamber. the second flange bearing in a closed position forming a second seal between the pipe and the chamber. The example shut-off device also includes a cutting blade in the chamber. The cutting blade tightens against the pipe to cut through the pipe and at least partially seals an opening in the cut pipe. The cutting blade is configured to operate as a gate valve.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a Continuation-ln-Part (GIP) of U.S. patentapplication Ser. No. 15/143,872 filed May 2, 2016 for “Shut-Off Device,”which claims the priority benefit of U.S. Provisional Patent ApplicationNo. 62/157,170 filed May 5, 2015 for “Universal Post-Failure Shut-offRescue Device,” hereby incorporated by reference in its entirety asthough fully set forth herein.

BACKGROUND

Pipes are commonly used in just about every home and commercial andgovernment buildings to carry water. Pipes and other conduits are alsoused in many industries to carry other liquids and gases such ashydraulic lines in factories and in heavy equipment. Millions of milesof pipes and conduits are part of our aging infrastructure. Largepipelines carry oil over huge distances. Pipes and other conduits maybecome damaged or break due to fatigue, corrosion, exposure to elementsand temperature differentials, as well as accidental or negligent damage(e.g. hitting or inadvertently cutting into or through the pipe), or dueto any number of other circumstances, even intentional sabotage. Whenpipes break, the resulting damage, physical, environmental and oftenmedical, from the water or other substances carried by the conduit, canbe extensive.

Many products on the market today focus on preventing breakage or leaksfrom occurring. As none of these are fail-proof however, with manysafety devices themselves suffering from fatigue and other factorsdiminishing their performance, breakages and leaks happen all the time.Sometimes the damages go into catastrophic proportions, depending on thesize and scope of the leak, type of substance, infrastructure anddistances involved, and how long it takes to shut off the source orotherwise stop the leak.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of an example shut-off device.

FIG. 2 is an exploded perspective view of an example shut-off device.

FIG. 3 is a front view of an example shut-off device.

FIG. 4 is a top view of an example shut-off device.

FIG. 5 is a side view of an example shut-off device.

FIGS. 6A-6C are side views illustrating operation of an example shut-offdevice.

FIG. 7 is a perspective view of another example sleeve housing for ashut-off device.

FIG. 8 shows an alternate example shut-off device, that may be used withthe buckle from FIG. 7 or other similar buckle.

FIG. 9 is an exploded component view of FIG. 8.

FIG. 10 is a close up view of the blade holding assembly for theshut-off device of FIGS. 8 and 9.

FIG. 11 is a closeup view of another blade holding assembly.

DETAILED DESCRIPTION

A shut-off device is disclosed. An example shut-off device includes anupper valve body, and a lower valve body. The lower valve body connectsto the upper valve body to surround a section of a pipe to form achamber. A cutting blade in the chamber is tightening against the pipeto cut through the pipe, and seal or at least partially seal the openingin the cut pipe. Following a repair to the pipe, the cutting blade maybe operated as a gate valve, opening to permit fluid flow through thepipe, and closing to at least partially restrict or fully stop fluidflow through the pipe.

In an example, the shut-off device may be implemented as a universalpost-failure shut-off rescue device. The shut-off device can beimplemented to shut off a section of pipe, e.g., so that a repair can bemade. The shut-off device may be operated to stop leakage and/or otherspills from a conduit (also referred to herein as a “pipe”) transportinga liquid or gas. The device may be operated even after all othershut-off systems (e.g., valves) have failed.

In an example, the shut-off device is assembled onto the pipe at adesired location, e.g., upstream from the damage or point of failure andthen operated to cut through or sever the pipe while simultaneouslyclosing the pipe to restrict or altogether stop flow out of the pipe. Insome cases another device may be assembled onto the pipe downstream toprevent backflow.

Following repair, the shut-off device can be operated to restore normalflow in the pipe. In an example, the shut-off device can remain in placeafter the pipe has been repaired, and operated as a gate valve, e.g., toallow and to stop fluid flow within the pipe.

The shut-off device may be implemented to slow or even entirely stopsleaks (including small leaks, spills, and even entire blowouts). Theshut-off device can be implemented with any of a wide variety ofdifferent types and/or sizes of pipe, including but not limited to,hoses, water lines, gas lines, oil pipes and pipelines, above ground,subsurface, and/or in submarine environments.

Before continuing, it is noted that as used herein, the terms “includes”and “including” mean, but are not limited to, “includes” or “including”and “includes at least” or “including at least.” The term “based on”means “based on” and “based at least in part on.” The term “pipe” is notlimited in scope. That is, the shut-off device described herein may beused with any type or size pipe or other conduit.

FIG. 1 is a perspective view of an example shut-off device 10. FIG. 2 isan exploded perspective view of the example shut-off device 10 shown inFIG. 1. It is noted that components shown in FIG. 2 are illustrated inan exploded view to better call out individual components. However,these components are not necessarily detachable. That is, multiple ofthe components may be formed as a single unit, such as variouscomponents of the valve housing (e.g., the upper valve body 14 andvarious components of the lower valve body 16). Assembly of the devicewill be well understood by those having ordinary skill in the art afterbecoming familiar with the teachings herein.

The example shut-off device 10 shown in FIGS. 1 and 2 includes a valvebody 12 having an upper valve body 14, and a lower valve body 16. Thelower upper body 14 and the lower valve body 16 can be assembledtogether around a section of a pipe 1 and form a chamber 18 (visible inFIG. 2) within the valve body 12.

A cutting blade 20 is provided in the chamber 18. In an example, thesize of the cutting blade 20 is larger than twice the diameter of thepipe 1. Such a configuration enables the cutting blade 20 to performboth a cutting function and a blocking or sealing function.

In an example, the chamber 18 is sized to retain the cutting blade 20and permit movement therein, without being over-sized. This is becausefluid may flow into the chamber 18 and it is desired to let as littlefluid into the chamber 18 as possible.

In another example, the chamber 18 is sized to accommodate the cuttingblade 20. For example, the chamber 18 may be enlarged to accommodateother structure, such as an internal block (not shown) and/orinstallation of driving assembly (e.g., gears, not shown) for thecutting blade 20. The size of chamber 18 may be configured based onvarious drive options for the cutting blade, such as but not limited to,mechanical, electrical, hydraulic, and/or pneumatic drive assemblies(e.g., gears, motors, pistons, etc.).

In an example, the cutting blade 20 may be operated by handle 22.Turning the handle 22 rotates the threaded lead screw 24 throughthreaded block or nut 26. The threaded block 26 serves to brace thethreaded lead screw 24 and cause the cutting blade 20 move up or downwithin the chamber 18.

In an example, the cutting blade 20 may be tightened with sufficientdownward pressure so as to cut through the pipe 1. In another example,the cutting blade 20 may be tightened to provide pressure against theouter perimeter of the pipe 1, and then the shut-off device 10 may berotated about the pipe while continuing to apply pressure to the blade(e.g., by rotating handle 22) to cut through the pipe 1.

Cutting through the pipe 1 at least partially seals the open end in thepipe 1 that was formed by cutting the pipe 1. In an example, the cuttingblade 20 seals against the open end of the pipe 1 to slow or stop fluidflow. In another example, fluid from the pipe 1 may leak or flow intothe chamber 18 and is sealed within the chamber 18. As such, theshut-off device 10 slows or altogether stops fluid flow from the openingin the pipe 1.

In an example, the shut-off device 10 includes a first valve clamp 28 ato secure the upper valve body 14 to the lower valve body 16. A secondvalve clamp 28 b secures the opposite side of the shut-off device 10.

A first flange bearing 30 a may be provided as a seal between the firstvalve clamp 28 a and the pipe 1. A second flange bearing 30 b seals thesecond valve clamp 28 b and the pipe 1 on the opposite side. The firstand second flange bearings 28 a and 28 b form a sleeve housing. Thefirst and second flange bearings 28 a and 28 b may have an upper portionand a lower portion so that the flange bearings can be assembled ontothe pipe 1. Another example sleeve housing is shown in FIG. 7.

The example first flange bearings 28 a and 28 b may include a seat 32 aand 32 b, respectively. The seat 32 a and 32 b may be a rubber gasket,or other pliable material provided on the surface that is in contactwith the pipe 1, or therebetween. The seat 32 a and 32 b provides a sealagainst the pipe 1, and may also aid in retaining the shut-off device 10in position on the pipe 1, e.g., during a cutting operation and/or afterthe pipe 1 is cut and pressure builds up due to the fluid being releasedinto the chamber 18. As such, the seat 32 a and 32 b serves as a sealand/or as a pressure side retainer ring to prevent the section of thepipe from sliding relative to the shut-off device 10.

Although not shown, other seals (e.g., gasket, washer, or O-ring) mayalso be provided. An example can be seen by the end-view of O-rings 40 aand 40 b seen in the cross-sectional view of FIGS. 6A-6C. These sealscan be readily implemented with the shut-off device 10 by one havingordinary skill in the art after becoming familiar with the teachingsherein, in order to better seal the shut-off device 10 against leaks.

FIG. 3 is a front view of an example shut-off device 10. FIG. 4 is a topview of an example shut-off device 10. The shut-off device 10 includes acutting blade 20 installed in a housing. The housing may includeseparate portions which may be connected, e.g., by fastener (not shown)to form an integrated single unit. The “split” configuration of thehousing enables the shut-off device 10 to be separated and assembledonto the pipe 1.

It is noted that the assembled components of the housing may be anysize, shape, and/or other configuration. The specific configuration maybe based on design consideration, such as but not limited to the size ofthe pipe (e.g., pipe diameter). In general, the assembled components onthe pipe 1 should form a tight fit between the shut-off device 10 andthe pipe 1.

Before continuing, it should be noted that the examples described aboveare provided for purposes of illustration, and are not intended to belimiting. Other devices and/or device configurations may be utilized tocarry out the operations described herein. Various other configurationsof the shut-off device 10 are also contemplated, as will be apparent tothose having ordinary skill in the art after becoming familiar with theteachings herein.

By way of illustration, the shut-off device 10 may include a cuttingwheel. The blade is operable to cut through the pipe (e.g., by rotatingthe wheel or slicing straight through with the blade) sufficiently tocut through the entire pipe and thereby shut-off flow. In an example,the entire cutting wheel, including the housing, rotates around thepipe, cutting the pipe, thereby covering the entire opening of the pipewith the gate valve (or any valve or other mechanical device), andconsequently shutting off the flow.

It is noted that the assembled device may be configured based at leastin part on the diameter of the pipe, e.g., to provide a tight fit whilestill enabling the cutting wheel to rotate about the pipe 1.

By way of further illustration, the shut-off device 10 may be configuredfor low-pressure environments (e.g., fluid flow within the pipe of about50-70 psi), such as is typical in household water pipes. An exampleconfiguration includes a larger chamber 18. That is, the chamber 18 isnot as tight surrounding the blade 20 as it may be in a higher pressureenvironment. In an example, the chamber 18 may be configured largeenough to receive an internal block (not shown), which can be forcedagainst the pipe 1 during cutting. In this embodiment, a low flow (e.g.,dripping) may be observed after severing the pipe. But this typically isnot expected to impact the repair work on the pipe 1.

Regardless of the specific configuration of the shut-off device 10, itmay be implemented to prevent leakage at a damaged portion of the pipe1, as shown in FIG. 5. FIG. 5 is a side view of an example shut-offdevice. In this example, flow is coming from a source (e.g., the citywater pipes) as illustrated by arrow 3, and headed downstream (e.g.,toward a sink faucet) as illustrated by arrow 4.

In an example, the shut-off device 10 can be assembled in closeproximity, upstream from the damaged area 2 a of the pipe 1. Forexample, the shut-off device 10 may be assembled in close proximity whenthe pipe 1 is damaged but not leaking.

In another example, where the pipe is leaking from the damaged area, theshut-off device 10 can be assembled over the damaged portion 2 a of thepipe 1. That is, the first valve clamp 28 a and first flange bearing 30a may cover a leak from the damaged portion 2 b to stop the leak in theshort term, while the cutting blade 20 is operated. After the cuttingblade 20 has cut through the pipe and is blocking flow 3 (e.g., servingas an emergency gate valve), the first valve clamp 28 a and first flangebearing 30 a may be removed from the shut-off device 10 and the damagedportion 2 b repaired.

Following stoppage (or slowing) of the leak, the sleeve housing beyondthe “valve” that has been formed, may be opened independently to removethe damaged pipe so that a new pipe can be inserted and installed. Thisportion of the sleeve housing can then be closed again and the gatevalve can be re-opened and re-closed as needed (e.g., as an emergencygate valve) to resume normal flow and to control volume and pressure ofthe flow in the repaired pipe. In an example, the gate valve cannot beremoved and reused, thereby maintaining the integrity of the originalinstallation.

In another example, where the pipe is not going to be repaired, theshut-off device 10 can be assembled directly over the damaged portion 2c. In this example, the damaged portion 2 c of the pipe 1 remains in thebody of the shut-off device 10. It may be self-sealing, internallysealed or by tightening a lever compression clamp.

In an example, the shut-off device 10 may be operated to shut flow evenafter all other shut-off systems (e.g., valves) have failed. Inaddition, the shut-off device 10 can remain in place and serve as a gatevalve itself. That is, the cutting blade can be opened to permit fluidflow through the pipe 1, and closed to at least partially restrict orfully stop fluid flow through the pipe 1. These and other operationswill be discussed in more detail below with reference to theillustration shown in FIGS. 6A-6C.

FIGS. 6A-6C are side views illustrating operation of an example shut-offdevice 10. In FIG. 6A, the upper and lower portions of the shut-offdevice 10 may be assembled around the pipe 1. In an example, theshut-off device 10 provides a stationary sleeve housing which can bewrapped around the pipe in a sealed manner. This may be achieved byeither a hinged or clamp-like or other overlapping or boltedconfiguration, which is attached around the pipe below the failurepoint, to seal and retain the pipe adjacent the leak. For example, theshut-off device 10 may be bolted (or otherwise fastened) together toprovide a sealing surface on the pipe sections. Seats 32 a and 32 b(FIG. 2) and/or retainer rings (not shown) may be provided to reduce oraltogether eliminate the slide out tendency of pipe ends.

After assembling the shut-off device 10 at the desired location on thepipe 1, the cutting blade 20 may be operated to cut through the pipe 1(e.g., either by rotation or uni-directional force through the pipe 1),and close off the opening that has been cut, as illustrated by arrow 50a. The shut-off device 10 is configured to simultaneously stop a leak(e.g., by assembling over the leak) and serve as a sealed gate valve byshutting off the flow within the pipe and prevent further leaking fromthe pipe 1, as illustrated when the cutting blade 20 has fully cutthrough the pipe 1 and seated within portion 18′ of the chamber 18.

In an example, the housing sleeve on either side of the sealed gatevalve is configured to be assembled independently, and can thus beremoved to repair the pipe section after flow has been shut off by thecutting blade 20. That is, the shut-off device 10 fully depressurizesthe damaged section of the pipe and can either seal the flow, or atleast dampen flow to a minimal level that enables the valve clamp 28 aand/or 28 b and flange bearing 30 a and/or 30 b to be removed and thepipe repaired.

Following stoppage (or slowing) of the leak, the sleeve housing beyondthe “valve” that has been formed, may be opened independently to removethe damaged pipe so that a new pipe can be inserted and installed. In anexample, the valve clamp 28 a and/or 28 b and flange bearing 30 a and/or30 b can then be closed again and the cutting blade 20 implemented as agate valve. Of course, the pipe does not need to be repaired, and canremain either within the chamber 18 or sealed by the valve clamp 28 aand/or 28 b and flange bearing 30 a and/or 30 b.

The gate valve can be opened (e.g., in the direction of arrow 50 b inFIG. 6B) to resume normal flow and, partially or fully closed (e.g., inthe direction of arrow 50 a in FIG. 6A) to control volume and pressureof the flow in the pipe 1, as illustrated in FIG. 6B (closed) and FIG.6C (open). It is noted that the term “gate valve” is not limited to anyparticular type of valve, and other valves may also be implemented. Inan example, the gate valve cannot be removed and reused, therebymaintaining the integrity of the original installation.

The operations shown and described herein are provided to illustrateexample implementations. The operations are not limited to the orderingshown. Still other operations may also be implemented. By way ofillustration, the device may be configured for use on large industrialsize pipes (e.g., oil and gas pipelines). In an example, the device maybe operated by robotics or as an attachment to other equipment (e.g.,front loaders or large excavating machines).

FIG. 7 is a perspective view of another example sleeve housing 40 for ashut-off device. It is noted that the sleeve housing (e.g., as shown inFIG. 7 or otherwise) may be implemented by itself. That is, the sleevehousing can be tightened around a damaged portion of a pipe to seal thepipe without anything further being implemented. In another example, thesleeve housing (e.g., as shown in FIG. 7 or otherwise) can beimplemented with the cut-off housing, which is employed ads describedabove. That is, the sleeve housing may be utilized to temporarily“patch” a leak until the cut-off housing can be installed and shut offthe water supply.

In another example, the sleeve housing 40 may take the place of thevalve clamp 28 a and seat 32 a shown in FIGS. 1 and 2, or of valve clamp28 b and seat 32 b, or both.

The sleeve housing 40 shown in FIG. 7 may be configured as aquick-release lever and/or buckle assembly. In an example, the sleevehousing includes a first buckle 41 a with a lever 42 a and hook 43 a,and and 41 b, and a second buckle 41 b with a lever 42 b and hook 43 b.When opened, these buckles 41 allow the sleeve housing 40 to be spreadopen along a seam 44, and either placed on or removed from a pipe 1.When closed, the buckles 41 latch the sleeve housing 40 in its closedposition, in order to attach it to a pipe 1.

The sleeve housing 40 can be opened and closed along the seam 44 toprovide a compression clamp. In an example, the sleeve housing includesa hardened outside (e.g., plastic or other material) and a pliableinside (e.g., rubber, foam, etc.). The sleeve housing shown in FIG. 7may be used instead of the first and second flange bearings 28 a and 28b to form a sleeve housing. The sleeve housing may be hinged on one sideand clamped on the other end (e.g., about 180 degrees apart from thehinge), or clamped on both ends. Alternatively, the sleeve housing 40may be made from a relatively pliable material such as spring steel thatallows it to be opened and closed without the need for a hinge.

It is also noted that the clamp configuration shown in FIG. 7 may alsobe implemented for the valve housing (e.g., the upper valve body 14 andvarious components of the lower valve body 16 in FIG. 1). That is, thevalve housing itself may be configured as a quick release lever/bucklecompression clamp. The valve housing may be configured as aquick-release lever and/or buckle assembly, such that it can be openedand closed to provide a compression clamp.

In an example, the FIG. 7 compression assembly (i.e., implemented as thevalve housing or the housing for the valve itself; or as a sleevehousing), has a hardened outside (e.g., plastic, metal, or other hardmaterial) and a pliable inside (e.g. rubber, foam, etc.), and a somewhatflexible configuration. In an example, the compression assembly may bespread open just sufficiently to surround a pipe and then closed via thequick-release lever and/or buckle and/or any other suitable clampingmechanism. In another example, the compression assembly may be hinged onone side and clamped on the other end (e.g., about 180 degrees apartfrom the hinge), or clamped on both ends. In an example the housing maybe a one-piece overlapping housing, in another example it may have thebuckle and/or lever or other suitable compression closure recessed in achannel to accomplish a flush configuration.

In an example, the quick-release lever and/or buckle assembly 41 mayserve to tighten (e.g., reduce the inner diameter of the sleeve housing)around the pipe as the lever is actuated. However, any suitable clampingmechanism may be implemented, and is not limited to the quick-releaselever and buckle assembly shown in FIG. 7. For example, the bolts shownin previous drawings may also be utilized, wherein tightening the boltstightens the housing around the pipe.

In another example, the sleeve housing 44 of FIG. 7 may be implementedby itself as a quick repair for broken pipes. This example is bestimplemented for low pressure flow pipes, such as drain pipes and commonhousehold pipes. It could also be employed as a shut-off device forsmall diameter pipes.

FIG. 8 shows an alternate example shut-off device. that may be used withthe buckle from FIG. 7 or other like buckle. This example shows acorkscrew-type handle 22 to tighten the threaded lead screw 24 into thethreaded block 26 and hold the the cutting blade 20 as it is turnedaround the pipe 1 to slowly cut a line around the pipe and/or directlythrough the pipe in “slice cut” mode. The blade is stabilized by rollers46. Rollers 46 may be provided in a channel as shown, to operate asroller bearings when making contact with the flat side(s) of the blade.Rollers 46 may be provided on one or both sides of the blade. Alsovisible are the upper valve body 14, lower valve body 16, threaded block16, flange bearings 30 a and 30 b, and sleeve housings 44 a and 44 b.

FIG. 9 is an exploded component view of FIG. 8. In this view, the pipe1, blade encasement and roller bearings, and flange fittings 30 havebeen omitted for clarity, so that the cutting blade 20, handle 22,threaded lead screw 24, threaded block 26, and sleeve housings 44 a and44 b may be seen more clearly.

FIG. 10 is a close up view of the blade holding assembly for theshut-off device of FIGS. 8 and 9. In this example, the rollers 46 areshown as these may support and straighten the blade 20 such that anywobbling is minimized.

FIG. 11 is a closeup view of another blade holding assembly. In thisexample, the rollers 46 which support and straighten the blade asdescribed for FIG. 9 are provided with axles to retain the rollers 46 ina predetermined positioning on the blade.

It is noted that the examples shown and described are provided forpurposes of illustration and are not intended to be limiting. Stillother examples are also contemplated.

1. A shut-off device, comprising: a valve body to surround a section ofa pipe and form a chamber about the section of the pipe; a first flangebearing on a first side of the chamber, the first flange bearing in aclosed position forming a first seal between the pipe and the chamber; asecond flange bearing on a second side of the chamber, the second flangebearing in a closed position forming a second seal between the pipe andthe chamber; a cutting blade in the chamber, the cutting bladetightening against the pipe to cut through the pipe and at leastpartially seal an opening in the cut pipe; wherein the cutting blade isconfigured to operate as a gate valve, in an open position permittingfluid flow through the pipe, and in a closed position at least partiallyrestricting or fully stopping fluid flow through the pipe.
 2. Theshut-off device of claim 1, wherein the first and second flange bearingsform a sleeve housing.
 3. The shut-off device of claim 1, wherein thevalve body has an upper valve body and a lower valve body.
 4. Theshut-off device of claim 3, further comprising at least one valve clampto secure the upper valve body to the lower valve body.
 5. The shut-offdevice of claim 4, further comprising a second valve clamp to secure theupper valve body to the lower valve body.
 6. The shut-off device ofclaim 3, wherein the lower valve body connects to the upper valve bodyto surround the section of the pipe and form the chamber.
 7. Theshut-off device of claim 1, wherein the first flange bearing has anupper portion and a lower portion.
 8. The shut-off device of claim 7,further comprising a seat in the first flange bearing to engage againstthe pipe.
 9. The shut-off device of claim 1, wherein the second flangebearing has an upper portion and a lower portion.
 10. The shut-offdevice of claim 9, further comprising a seat in the second flangebearing to engage against the pipe.
 11. The shut-off device of claim 1,further comprising a lead screw to open and close the cutting blade. 12.A shut-off device, comprising: a valve body to surround a section of apipe and form a chamber about the section of the pipe; a first sleevehousing bearing on a first side of the chamber, the first sleeve housingin a closed position forming a first seal between the pipe and thechamber; a second sleeve housing on a second side of the chamber, thesecond sleeve housing in a closed position forming a second seal betweenthe pipe and the chamber; a cutting blade in the chamber, the cuttingblade tightening against the pipe to cut through the pipe and at leastpartially seal an opening in the cut pipe; wherein the cutting blade isconfigured to operate as a gate valve, in an open position permittingfluid flow through the pipe, and in a closed position at least partiallyrestricting or fully stopping fluid flow through the pipe.
 13. Theshut-off device of claim 12, wherein the sleeve housing is configured asa quick-release lever with a buckle assembly.
 14. The shut-off device ofclaim 12, wherein the sleeve housing provides a compression clamp aboutthe pipe.
 15. The shut-off device of claim 12, wherein the sleevehousing has a hardened outside.
 16. The shut-off device of claim 12,wherein the sleeve housing has a pliable inside.
 17. The shut-off deviceof claim 12, wherein the sleeve housing is hinged on one side andclamped on the other end at about 180 degrees apart from the hingedside.
 18. The shut-off device of claim 12, wherein the sleeve housing isclamped on opposite ends.
 19. The shut-off device of claim 12, whereinthe sleeve housing is removable from the valve body and operableindependently of the valve body to seal a leak in the pipe.